root@rynet-desktop:/media/hda1# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda2             9.2G  2.6G  6.2G  30% /
varrun                760M  212K  760M   1% /var/run
varlock               760M     0  760M   0% /var/lock
udev                  760M   88K  760M   1% /dev
devshm                760M     0  760M   0% /dev/shm
lrm                   760M   34M  726M   5% /lib/modules/2.6.22-14-generic/volatile
root@rynet-desktop:/media/hda1# umount /dev/hdb1
umount: /dev/hdb1: not mounted
root@rynet-desktop:/media/hda1# mount /dev/hdb1
$LogFile indicates unclean shutdown (0, 0)
Failed to mount '/dev/hdb1': Operation not supported
Mount is denied because NTFS is marked to be in use. Choose one action:

Choice 1: If you have Windows then disconnect the external devices by
          clicking on the 'Safely Remove Hardware' icon in the Windows
          taskbar then shutdown Windows cleanly.

Choice 2: If you don't have Windows then you can use the 'force' option for
          your own responsibility. For example type on the command line:

            mount -t ntfs-3g /dev/hdb1 /media/hdb1 -o force

    Or add the option to the relevant row in the /etc/fstab file:

            /dev/hdb1 /media/hdb1 ntfs-3g defaults,force 0 0